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client.go
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client.go
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package kv
import (
"bytes"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/sirupsen/logrus"
)
const (
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Maximum message size allowed from peer.
maxMessageSize = 512000
)
var (
newline = []byte{'\n'}
space = []byte{' '}
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
}
type Client interface {
Options() ClientOptions
Close()
SendMessage([]byte)
SendJSON(interface{})
SetUID(int64)
UID() int64
}
// Client is a middleman between the websocket connection and the hub.
type WebsocketClient struct {
hub *Hub
// Unique ID
uid int64
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
options ClientOptions
}
// ClientOptions is a list of tweakable options for clients
type ClientOptions struct {
// Adds a prefix to all key operations to restrict them to a namespace
Namespace string
}
// readPump pumps messages from the websocket connection to the hub.
//
// The application runs readPump in a per-connection goroutine. The application
// ensures that there is at most one reader on a connection by executing all
// reads from this goroutine.
func (c *WebsocketClient) readPump(hub *Hub) {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(maxMessageSize)
c.conn.SetReadDeadline(time.Now().Add(pongWait))
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, message, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
hub.logger.WithFields(logrus.Fields{
"error": err.Error(),
"client": c.conn.RemoteAddr(),
}).Info("abnormal close from client")
}
break
}
message = bytes.TrimSpace(bytes.Replace(message, newline, space, -1))
c.hub.incoming <- rawMessage{c, message}
}
}
// writePump pumps messages from the hub to the websocket connection.
//
// A goroutine running writePump is started for each connection. The
// application ensures that there is at most one writer to a connection by
// executing all writes from this goroutine.
func (c *WebsocketClient) writePump() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
// The hub closed the channel.
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
w.Write(message)
// Add queued chat messages to the current websocket message.
n := len(c.send)
for i := 0; i < n; i++ {
w.Write(newline)
w.Write(<-c.send)
}
if err := w.Close(); err != nil {
return
}
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
func (c *WebsocketClient) SetUID(uid int64) {
c.uid = uid
}
func (c *WebsocketClient) UID() int64 {
return c.uid
}
func (c *WebsocketClient) SendJSON(data interface{}) {
msg, _ := json.Marshal(data)
c.send <- msg
}
func (c *WebsocketClient) SendMessage(data []byte) {
c.send <- data
}
func (c *WebsocketClient) Options() ClientOptions {
return c.options
}
func (c *WebsocketClient) Close() {
close(c.send)
}
// ServeWs is the legacy handler for WS
func ServeWs(hub *Hub, w http.ResponseWriter, r *http.Request) {
hub.CreateClient(w, r, ClientOptions{})
}
// CreateClient upgrades a HTTP request to websocket and makes it a client for the hub
func (hub *Hub) CreateClient(w http.ResponseWriter, r *http.Request, options ClientOptions) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
hub.logger.WithField("error", err.Error()).Error("error starting websocket session")
return
}
client := &WebsocketClient{
hub: hub, conn: conn,
send: make(chan []byte, 256), options: options,
}
client.hub.register <- client
// Allow collection of memory referenced by the caller by doing all work in
// new goroutines.
go client.writePump()
go client.readPump(hub)
}